​​​​​​​ LONDON Apple is facing a £3 billion ($4 billion) class-action lawsuit from a consumer advocacy group that accused the company of overcharging millions of British customers for iCloud storage services. If the case is successful, the payout could equate to about £70 per affected customer, with the class action covering 40 million people who have used and paid for Apple’s iCloud storage since October 2015. The consumer group, Which?, alleges that Apple has locked users into paying “rip-off